You will find Volunruud North of Whiterun, on the Mountain where the snow starts. Once inside read Heddic's Volunruud Journal to begin the quest.

Getting the two Ceremonial weapons (an axe and sword) is fairly straightforward. You'll need to fight off an assortment of Draugr, but there are a few traps. Once you've retrieved both weapons return to the central chamber and enter the Elder's Cairn.

Inside you will have to defeat Kvell the Tongue. He is a ghost dual-wielding the weapons you just found and is accompanied by both a Draugr Scourge and Frost Atronach. Focus on Kvell and let your follower tank the Atronach. Ignore the Atronach because the Draugr will be able to summon it infinitely. Deal with the Draugr after bombing Kvell.